How to set the parentidfield for Combobox with dataSetType: tree?

[dw_qservices]

Hi,

How do I set the parentidfield for a combobox with dataSetType: tree?
I see that there is a pickTreeConstructor, which tells the combobox to use the PickTreeMenu, but I cannot see how to access the PickTreeMenu to set the parentidfield?

I'm using v12.1p_2020-08-16/Enterprise Development Only (built 2020-08-16)

Thanks!

[Isomorphic]

pickListProperties is used for both types of picker (TreeGrid is a ListGrid), so you can do it via dataProperties, like this:

    ...
    pickListProperties: {
        dataProperties: {
            modelType: "parent",
            idField: "id",
            parentIdField: "parentId"
        }
    }